test/aoj/3165/main.test.imos.cpp

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• Last update: 2021-04-23 23:44:44+09:00
• Problem: http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=3165

Depends on

• 1D Imos algorithm (Linear addition) (Mylib/Algorithm/linear_imos_1d.cpp)
• Input tuple (Mylib/IO/input_tuple.cpp)
• Input tuples (Mylib/IO/input_tuples.cpp)
• join function (Mylib/IO/join.cpp)

Code

#define PROBLEM "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=3165"

#include <iostream>
#include "Mylib/Algorithm/linear_imos_1d.cpp"
#include "Mylib/IO/input_tuples.cpp"
#include "Mylib/IO/join.cpp"

namespace hl = haar_lib;

int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);

  int N, Q;
  std::cin >> N >> Q;

  auto imos = hl::linear_imos_1d<int64_t>(N);

  for (auto [l, k] : hl::input_tuples<int, int>(Q)) {
    --l;
    imos.update(l, l + k, 1, 1);
  }

  const auto res = imos.build();

  std::cout << hl::join(res.begin(), res.end()) << "\n";

  return 0;
}

#line 1 "test/aoj/3165/main.test.imos.cpp"
#define PROBLEM "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=3165"

#include <iostream>
#line 2 "Mylib/Algorithm/linear_imos_1d.cpp"
#include <cassert>
#include <vector>

namespace haar_lib {
  template <typename T>
  class linear_imos_1d {
  public:
    using value_type = T;

  private:
    int n_;
    std::vector<T> vec_a_, vec_a_end_, vec_b_;

  public:
    linear_imos_1d(int n) : n_(n), vec_a_(n_ + 1), vec_a_end_(n_ + 1), vec_b_(n_ + 1) {}

    void update(int s, int t, const T &a, const T &b) {
      assert(0 <= s and s <= t and t <= n_);
      vec_a_[s + 1] += a;
      vec_a_[t] -= a;

      vec_a_end_[t] -= a * (t - s - 1);

      vec_b_[s] += b;
      vec_b_[t] -= b;
    }

    auto build() const {
      std::vector<T> ret(vec_a_);
      for (int i = 0; i < n_; ++i) ret[i + 1] += ret[i];
      for (int i = 0; i < n_; ++i) ret[i] += vec_a_end_[i];
      for (int i = 0; i < n_; ++i) ret[i + 1] += ret[i];

      std::vector<T> temp(vec_b_);
      for (int i = 0; i < n_; ++i) temp[i + 1] += temp[i];
      for (int i = 0; i < n_; ++i) ret[i] += temp[i];

      ret.pop_back();

      return ret;
    }
  };
}  // namespace haar_lib
#line 2 "Mylib/IO/input_tuples.cpp"
#include <initializer_list>
#line 4 "Mylib/IO/input_tuples.cpp"
#include <tuple>
#include <utility>
#line 6 "Mylib/IO/input_tuple.cpp"

namespace haar_lib {
  template <typename T, size_t... I>
  static void input_tuple_helper(std::istream &s, T &val, std::index_sequence<I...>) {
    (void) std::initializer_list<int>{(void(s >> std::get<I>(val)), 0)...};
  }

  template <typename T, typename U>
  std::istream &operator>>(std::istream &s, std::pair<T, U> &value) {
    s >> value.first >> value.second;
    return s;
  }

  template <typename... Args>
  std::istream &operator>>(std::istream &s, std::tuple<Args...> &value) {
    input_tuple_helper(s, value, std::make_index_sequence<sizeof...(Args)>());
    return s;
  }
}  // namespace haar_lib
#line 8 "Mylib/IO/input_tuples.cpp"

namespace haar_lib {
  template <typename... Args>
  class InputTuples {
    struct iter {
      using value_type = std::tuple<Args...>;
      value_type value;
      bool fetched = false;
      int N, c = 0;

      value_type operator*() {
        if (not fetched) {
          std::cin >> value;
        }
        return value;
      }

      void operator++() {
        ++c;
        fetched = false;
      }

      bool operator!=(iter &) const {
        return c < N;
      }

      iter(int N) : N(N) {}
    };

    int N;

  public:
    InputTuples(int N) : N(N) {}

    iter begin() const { return iter(N); }
    iter end() const { return iter(N); }
  };

  template <typename... Args>
  auto input_tuples(int N) {
    return InputTuples<Args...>(N);
  }
}  // namespace haar_lib
#line 3 "Mylib/IO/join.cpp"
#include <sstream>
#include <string>

namespace haar_lib {
  template <typename Iter>
  std::string join(Iter first, Iter last, std::string delim = " ") {
    std::stringstream s;

    for (auto it = first; it != last; ++it) {
      if (it != first) s << delim;
      s << *it;
    }

    return s.str();
  }
}  // namespace haar_lib
#line 7 "test/aoj/3165/main.test.imos.cpp"

namespace hl = haar_lib;

int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);

  int N, Q;
  std::cin >> N >> Q;

  auto imos = hl::linear_imos_1d<int64_t>(N);

  for (auto [l, k] : hl::input_tuples<int, int>(Q)) {
    --l;
    imos.update(l, l + k, 1, 1);
  }

  const auto res = imos.build();

  std::cout << hl::join(res.begin(), res.end()) << "\n";

  return 0;
}

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